In a shunt-wound dc motor with the field coils and rotor connected in parallel (see the figure (Figure 1)), the resistance Rf of the field coils is Rf = 103 Ω and the resistance Rr of the rotor is Rr = 5.5 Ω. When a potential difference of V = 120 V is applied to the brushes and the motor is running at full speed delivering mechanical power, the current supplied to it is 4.90 A.
Part A.) What is the current in the field coils?
If = _______ A
Part B.) What is the current in the rotor?
Ir = _______A
Part C.) What is the induced emf developed by the motor?
ε = _______ V
Part D.) How much mechanical power is developed by this motor?
Pmech = _______ W
Homework Answers
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In a shunt-wound dc motor with the field coils and rotor
connected in parallel (see the...
A shunt-wound DC motor with the field coils and rotor connected in parallel (see the figure)...
A shunt-wound DC motor with the field coils and rotor connected
in parallel (see the figure) (Figure 1) operates from a 130 V DC
power line. The resistance of the field windings, Rf, is
234 ? . The resistance of the rotor, Rr, is 4.10 ? . When
the motor is running, the rotor develops an emf E. The motor draws
a current of 4.82 A from the line. Friction losses amount to 47.0 W
.
A DC Motor 24 of 25 > Part A A shunt-wound DC motor with the field...
A DC Motor 24 of 25 > Part A A shunt-wound DC motor with the field coils and rotor connected in parallel (see the figure) (Figure 1)operates from a 135 V DC power line. The resistance of the field windings, Rf, is 203 2. The resistance of the rotor, R is 5.60 ? , when the motor is running, the rotor develops an emf E. The motor draws a current of 4.90 A from the line. Friction losses amount to...
a dc motor with its rotor and filed coils connected in serieshas an internal resistance of...
a dc motor with its rotor and filed coils connected in serieshas an internal resistance of 3.2Ω. when running at full load on a 120-v lined,the emf inthe rotor is 105V. a)what is the current drawn by the motor from the line? b)what is the power delivered to the motor? c) what is the mechanical power developed by this motor? these are the questions....
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A shunt-wound DC motor with the field coils and rotor connected
in parallel (see the figure) (Figure 1) operates from a 130 V DC
power line. The resistance of the field windings, Rf, is
234 ? . The resistance of the rotor, Rr, is 4.10 ? . When
the motor is running, the rotor develops an emf E. The motor draws
a current of 4.82 A from the line. Friction losses amount to 47.0 W
.
A DC Motor 24 of 25 > Part A A shunt-wound DC motor with the field coils and rotor connected in parallel (see the figure) (Figure 1)operates from a 135 V DC power line. The resistance of the field windings, Rf, is 203 2. The resistance of the rotor, R is 5.60 ? , when the motor is running, the rotor develops an emf E. The motor draws a current of 4.90 A from the line. Friction losses amount to...
The power input to a dc shunt motor during rated-load conditions
is 100 W. The rotor speed is 2000 r/min, and the armature voltage
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the no-load rotor speed.
2. The power input to a dc shunt motor during rated-load conditions is 100W. The rotor speed is 2000r/min, and the armature voltage is 100V. The armature resis- tance is 2 Ω and Rf-200Ω. Calculate the no-load rotor...
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A 8250 w shunt DC motor has a terminal voltage of 300 V. A field resistance Rf of 40 Ω, and an armature resistance Ra of 250 mm2. The field winding has 1500 turns. An adjustable resistance Rad is connected in series to the field winding. Rad is set at 20 Ω, but it can vary from 0 to 80 Ω. The magnetization curve is shown in Figure.1 and it is taken at a speed of 1200 rpm. (Armature reaction...
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